Bug 1184

Hello Stefan,

This error is being produced in the TeeChart code here:

        if (IAxisSize > 0)
        {

          tmp = inverted ? IEndPos - value : value - IStartPos;
          tmp *= iRange / IAxisSize;

          return horizontal ? iMinimum + tmp : iMaximum - tmp;
        }

tmp is calculated as Double.Infinity. In fact, the same issue can be observed running the following code:

      double large = 1.79E+308;
      large *= 500;

500 is about the normal size of the value of tmp, with iRange having a slightly larger value than 1.79E+308. I will have to think a little about the best way of avoiding this error being thrown. Many thanks for reporting it to us.

Stefan,

The best workaround I've found to date would be this:

    private void InitializeChart()
    {
      Points points1 = new Points(tChart1.Chart);
      points1.Pointer.InflateMargins = false;
      points1.ValueFormat = "0.###E+0";
      tChart1.Axes.Left.Labels.ValueFormat = "0.###E+0";
      tChart1.GetNextAxisLabel +=tChart1_GetNextAxisLabel;
      points1.Add(0, 5);
      points1.Add(1, 1.79E+308);
    }

    void tChart1_GetNextAxisLabel(object sender, GetNextAxisLabelEventArgs e)
    {
      if (((Steema.TeeChart.Axis)sender).Equals(tChart1.Axes.Left))
      {
        e.Stop = false;
        switch (e.LabelIndex)
        {
          case 0:
            e.LabelValue = 5;
            break;
          case 1:
            e.LabelValue = 1.79E+308;
            break;
          default:
            e.Stop = true;
            break;
        }
      }
    }

It is always different working with values whose arithmetic relationship is beyond double precision, such as (5, 1.79E+308) ... e.g.

    private void button4_Click(object sender, EventArgs e)
    {
      double large = 1.79E+308;
      double small = 5;

      double subtract = large - small;

      MessageBox.Show(Utils.MinimalDifference(large, subtract, 1).ToString());
    }